Reviewed by: melifaro, kp Approved by: kp (mentor) Differential Revision: https://reviews.freebsd.org/D37729
211 lines
5.4 KiB
C
211 lines
5.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2021-2022 Alexander V. Chernikov
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_route.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <net/route.h>
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#include <net/route/route_ctl.h>
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#include <net/route/route_var.h>
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#include <net/route/nhop.h>
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struct rib_subscription {
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CK_STAILQ_ENTRY(rib_subscription) next;
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rib_subscription_cb_t *func;
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void *arg;
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struct rib_head *rnh;
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enum rib_subscription_type type;
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struct epoch_context epoch_ctx;
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};
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static void destroy_subscription_epoch(epoch_context_t ctx);
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void
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rib_notify(struct rib_head *rnh, enum rib_subscription_type type,
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struct rib_cmd_info *rc)
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{
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struct rib_subscription *rs;
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CK_STAILQ_FOREACH(rs, &rnh->rnh_subscribers, next) {
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if (rs->type == type)
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rs->func(rnh, rc, rs->arg);
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}
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}
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static struct rib_subscription *
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allocate_subscription(rib_subscription_cb_t *f, void *arg,
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enum rib_subscription_type type, bool waitok)
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{
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struct rib_subscription *rs;
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int flags = M_ZERO | (waitok ? M_WAITOK : M_NOWAIT);
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rs = malloc(sizeof(struct rib_subscription), M_RTABLE, flags);
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if (rs == NULL)
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return (NULL);
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rs->func = f;
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rs->arg = arg;
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rs->type = type;
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return (rs);
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}
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/*
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* Subscribe for the changes in the routing table specified by @fibnum and
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* @family.
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*
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* Returns pointer to the subscription structure on success.
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*/
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struct rib_subscription *
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rib_subscribe(uint32_t fibnum, int family, rib_subscription_cb_t *f, void *arg,
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enum rib_subscription_type type, bool waitok)
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{
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struct rib_head *rnh;
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struct epoch_tracker et;
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NET_EPOCH_ENTER(et);
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KASSERT((fibnum < rt_numfibs), ("%s: bad fibnum", __func__));
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rnh = rt_tables_get_rnh(fibnum, family);
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NET_EPOCH_EXIT(et);
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return (rib_subscribe_internal(rnh, f, arg, type, waitok));
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}
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struct rib_subscription *
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rib_subscribe_internal(struct rib_head *rnh, rib_subscription_cb_t *f, void *arg,
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enum rib_subscription_type type, bool waitok)
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{
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struct rib_subscription *rs;
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struct epoch_tracker et;
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if ((rs = allocate_subscription(f, arg, type, waitok)) == NULL)
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return (NULL);
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rs->rnh = rnh;
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NET_EPOCH_ENTER(et);
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RIB_WLOCK(rnh);
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CK_STAILQ_INSERT_HEAD(&rnh->rnh_subscribers, rs, next);
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RIB_WUNLOCK(rnh);
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NET_EPOCH_EXIT(et);
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return (rs);
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}
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struct rib_subscription *
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rib_subscribe_locked(struct rib_head *rnh, rib_subscription_cb_t *f, void *arg,
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enum rib_subscription_type type)
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{
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struct rib_subscription *rs;
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NET_EPOCH_ASSERT();
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RIB_WLOCK_ASSERT(rnh);
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if ((rs = allocate_subscription(f, arg, type, false)) == NULL)
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return (NULL);
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rs->rnh = rnh;
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CK_STAILQ_INSERT_HEAD(&rnh->rnh_subscribers, rs, next);
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return (rs);
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}
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/*
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* Remove rtable subscription @rs from the routing table.
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* Needs to be run in network epoch.
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*/
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void
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rib_unsubscribe(struct rib_subscription *rs)
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{
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struct rib_head *rnh = rs->rnh;
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NET_EPOCH_ASSERT();
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RIB_WLOCK(rnh);
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CK_STAILQ_REMOVE(&rnh->rnh_subscribers, rs, rib_subscription, next);
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RIB_WUNLOCK(rnh);
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NET_EPOCH_CALL(destroy_subscription_epoch, &rs->epoch_ctx);
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}
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void
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rib_unsubscribe_locked(struct rib_subscription *rs)
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{
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struct rib_head *rnh = rs->rnh;
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NET_EPOCH_ASSERT();
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RIB_WLOCK_ASSERT(rnh);
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CK_STAILQ_REMOVE(&rnh->rnh_subscribers, rs, rib_subscription, next);
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NET_EPOCH_CALL(destroy_subscription_epoch, &rs->epoch_ctx);
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}
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/*
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* Epoch callback indicating subscription is safe to destroy
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*/
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static void
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destroy_subscription_epoch(epoch_context_t ctx)
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{
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struct rib_subscription *rs;
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rs = __containerof(ctx, struct rib_subscription, epoch_ctx);
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free(rs, M_RTABLE);
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}
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void
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rib_init_subscriptions(struct rib_head *rnh)
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{
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CK_STAILQ_INIT(&rnh->rnh_subscribers);
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}
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void
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rib_destroy_subscriptions(struct rib_head *rnh)
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{
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struct rib_subscription *rs;
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struct epoch_tracker et;
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NET_EPOCH_ENTER(et);
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RIB_WLOCK(rnh);
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while ((rs = CK_STAILQ_FIRST(&rnh->rnh_subscribers)) != NULL) {
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CK_STAILQ_REMOVE_HEAD(&rnh->rnh_subscribers, next);
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NET_EPOCH_CALL(destroy_subscription_epoch, &rs->epoch_ctx);
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}
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RIB_WUNLOCK(rnh);
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NET_EPOCH_EXIT(et);
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}
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